Messenger example - send auth request

• Refactor user search
• Add contact feature
• Save found contacts
• Add send request feature
• Send auth request
• Fix saving my contact during registration

Examples/xx-messenger/Sources/AppFeature/AppEnvironment+Live.swift

 import AppCore
+import ContactFeature
 import Foundation
 import HomeFeature
 import RegisterFeature
@@ -55,7 +56,12 @@ extension AppEnvironment {
                 UserSearchResultEnvironment()
               },
               contact: {
-                ContactEnvironment()
+                ContactEnvironment(
+                  messenger: messenger,
+                  db: dbManager.getDB,
+                  mainQueue: mainQueue,
+                  bgQueue: bgQueue
+                )
               }
             )
           }